When I read the last words of this verse I thought:
Oeh, that must have been a big angel,
that can roll away the big stone and then sit on it.
The two verses inbetween say: His appearance was like lightning, and his clothing white as snow. And for fear of him the guards trembled and became like dead men.
It must have been quite a sight to see the big stone gone,
and an even bigger angel on top of it